Engine



E. R. MUNN Feb. 20, 1945.

ENGINE s sheets-sheet 1 Filed July 30, 1942 Inventor Z701)? EMwmw B aan! E. R. MUNN Feb. 20, 1945.7

ENGINE Filed July 30, 1942 3 Sheets-Sheet 2 Feb. 20, 1945.

E. R. MUNN ENGINE Filed July 50, 1942 5 Sheets-Sheet 3 Patented Feb. 20,1945 UNITED STATES PATENT OFFICE Elvin Mnnn, Fair Play, Mo. ApplicationJuly 30, 1942, Serial No. 452,959 l (01. 74-44) 4 Claims.

The present invention relates to new and useful improvements in enginesof the reciprocating piston type of a generally similar character tothat constituting the subject matter of my copending application, SerialNo. 440,866, filed on April 28, 1942.

The primaryobject of the present invention is to provide, in a manner ashereinafter set forth, an engine of the aforementioned charactercomprising a crank shaft embodying a novel construction and operation.

Another very important object of the'invention is to provide an engineof the characterdescribed which includes a unique construction of mainbearing.

Other objects of the'invention are to provide an engine of the characterset forth which will be comparatively simple in construction, strong,durable, highly efllcient and reliable in operation, compact, and whichmay be manufactured at low cost.

All of the foregoing and still further objects and advantages of theinvention will become apparent from a study of the followingspecification, taken in connection with the accompanying drawings,wherein like characters of referoncedesignate corresponding partsthroughout the several views, and wherein:

Figure 1 is a view principally in vertical longitudinal section througha portion of an engine constructed in accordance with the presentinvention.

Figure 2 is a. view principally in vertical section throughamodification.

Figure 3 is a view in vertical longitudinal section through the mainbearing structure.

Figure 4 is a cross sectional view, taken substantially on the line 44of Figure 3.

Figure 5 is a plan view of one of the main bearing sleeve sections.

Figure 6 is an elevational view of one of the main bearing sleevesections, taken; at right angles to Figure 5.

Referring now to the drawings in detail, and

to Figure 1 thereof in particular, it will'be seen that referencecharacter I designates generally a crank shaft. The crank shaft Iincludes a plurality of spaced, longitudinally aligned sections 2 whichare journaled in main bearings 3 in the crank case 4 of an engine 5.

Arms 6 and 'l are fixed on theadjacent ends of the crank shaft sections2. Journaled in a bearing 8 on the arm 1 is a sleeve 8. Projecting fromthe arm 6 is a pin I II which is journaled in the sleeve 9.

The sleeve 9 is provided, on one end, with an integral peripherallygrooved or channeled eccentric II. A bearing on one end of a pistonconnecting rod I3 is journaled on the eccentric l I. Formed integrallywith the other end of the sleeve 9 is a gear 14. The gear I4 is in meshwith a gear 15 which is fixed on one end portion of the adjacent mainbearing 3.

In operation, the crank shaft sections 2, with the arms 6 and! thereon,rotate in unison. Thus, the gear l4 travels aroundthe stationary gearI5, thereby rotating the sleeve 9 with the eccentric II thereon. Theconstruction and arrangement is such that, at an intermediate point inthe upstroke of the piston 16 in its cylinder I! on the connecting rodii, there is a momentary pause or hesitation. When this pause occursduring the compression stroke of the piston It, the

charge in the cylinder is given a chance to mix more thoroughly beforeit is fired.

In the embodiment illustrated in Figure 2 of v the drawings, the crankshaft sections 2 are provided, on their adjacent ends, with arms l8 andI9, Projecting from the arm I9 is a tubular pin 20. A shaft 2| isjournaled in the tubular pin 20 and extends through the arm l9. It willbe observed that the end portions of the shaft 2| project beyond the armI9 and the tubular pin 20. A gear 22 is fixed on one end portion of theshaft 2| adjacent the arm I9. The gear 22 meshes with and travels arounda gear 23 on one end portion of the adjacent main bearing 3.

Rotatably mounted on the tubular pin 20 is a sleeve 24. The sleeve 24 isjoumaled, at an intermediate point, in a bearing 25 which is providedtherefor on the arm It. The sleeve 24 includes an enlarged end portion26 which is keyed, as at 21, to the corresponding end portion of theshaft 2|. Retaining nuts 28 are provided on the end portions of theshaft 2|. w

The sleeve 24 is provided, on its other end, with an integral,peripherally grooved or channeled eccentric 29. A hearing 30 on one endof a piston connecting rod 3| is journaled on the eccentric 28.

The operation of the Figure 2 form of the invention is substantiallysimilar to that of the Figure 1 embodiment. That is, the crank shaftsections 2 with the arms l8 and I9 thereon rotate in unison. However, asthe gear 22 travels around the stationary gear 23, rotation is impartedto the sleeve 24 and the eccentric 29 on the tubular pin 20 through theshaft 2| extending through said tubular pin.

In Figures 3 to 6. inclusive, of the drawings, reference character 23designates a main bearing for the crank shaft sections 2, said mainbearing having formed longitudinally therein keyways 34. In thisembodiment, the'crank shaft sections} are journaled in a. sleeve 3!which is provided therefor in the main bearing ll. The sleeve 3'comprises complemental half sections 30 having formed thereonlongitudinal keys 31 which are engaged in-the ways 34. The sleevesections 30 project from one end of the main bearing a and have formedthereon integral segments a constituting agear 39. The gear 3!, ofcourse, is stationar and is adapted to mesh with the gears l4 and 22.

It is believed that the many advantages of an engine constructed inaccordance with the present invention will be readily understood, andalthough preferred embodimentsare as illustrated and described, it is tobe understood that further modifications and changes in the details ofconstruction may be resorted to which will fall within the scope of theinvention as claimed.

What is claimed is:

1. In an engine of the character described, a crank case, a plurality oflongitudinally aligned main bearings in said crank case, longitudinallyspaced crank shaft sections journaled in said main bearings, arms fixedon the adjacent ends of the crank shaft sections, a pin projecting fromone of the arms, the other arm having a bearing, a sleeve rotatablymounted in the bearing of said. other arm and journaled on said pin, aneccentric on one end of thesleeve between said arms, a connecting rodhaving one end connected to a piston and its other end journaled on theeccentric, a gear on the other end of the sleeve at the outer side ofsaid other arm, and a stationary gear on an adjacent main bearingengaged withthe first-named gear for rotating the sleeve and theeccentric on the pin upon rotation 01 the crank shaft sections.

2. In an engine of the character described, a plurality of aligned mainbearings, a gear fixed. on one of said main bearings, crank shaftsections journaled in said main bearings, arms fixed on theadjacent endsof the crank shaft sections, a pin projecting from one of said arms, abearing on the other of said arms, a sleeve journaled in thesecond-named bearing and on said pin. an

eccentric on one end of said sleeve operable between the arms, a pistonconnecting rod having one end .ioui'naled on the eccentric, and a gearcoaxial'with and operatively connected to the sleeve, the last-namedgear being disposed at the outer side or one of said arms and meshingwith the flrstnamed gear for rotating said sleeve and the eccentric uponrotation of the crank shaft portions projecting from said one arm andsaid tubular pin, a sleeve journaled in the bearing of said arm androtatableon the tubular pin, means connecting one, end portion of thesleeve to one end portion of the shaft for actuation by said shaft, aneccentric on the other end ofthe sleeve operable between the arms, apiston connecting rod. journaled on said eccentric, and a gear fixed onthe other end portion of the shaft and meshing with the first-named gearfor actuation therebyfor rotatingthe sleeve and the eccentric.

4. In an engine ofthe character described, a main bearing havinglongitudinal ways ,therein, a sleeve mounted in said bearing, saidsleeve including complemental half sections, keys on said shaft sectionsengaged in the ways, a gear on one end of the sleeve, said gearincluding segments formed integrally with the sleeve sections, a crankshaft section .journaled in the sleeve, an arm fixed on said crank shaftsection and having a .bearing, a sleeve rotatably mounted in the bearingof said am, an eccentric for connection with a connecting rod providedon one end of the second-named sleeve, and a gear on the second-namedsleeve meshing with the first-named gear for actuation thereby uponrotation of the crank shaft section.

ELVIN R. MUNN.

